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Between 15-40% of people over 60 have low serum B12 levels (Pacholok & Stuart, 2011)

What characterizes the vendor channel: Product is sold as a research reagent, typically without prescription requirements Pricing ranges from $11-35 per vial depending on size and vendor Some vendors source from FDA-registered manufacturers and repackage

Skipping it because you feel fine. Symptoms appear after 13 years of deficiency

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The benzyl alcohol preservative extends usability of reconstituted compounds beyond a single withdrawal, but stability depends on the specific peptide or protein being studied

PMID 25208511